un·treat·ed | \ ˌən-ˈtrē-təd \

Definition of untreated 

: not treated untreated wastewater especially : not improved or controlled medically an untreated case of pneumonia untreated diabetic patients

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Synonyms & Antonyms for untreated


crude, native, natural, raw, rude, undressed, unprocessed, unrefined


dressed, processed, refined, treated

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Examples of untreated in a Sentence

Recent Examples on the Web

The 7th Circuit said the issue can't be framed specifically for each and every injury or illness, and that prison officials have known for years that leaving serious conditions untreated can amount to deliberate indifference. Bruce Vielmetti, Milwaukee Journal Sentinel, "Transgender inmate can sue over denial of hormone treatment, U.S. Appeals Court rules," 11 July 2018 Students with untreated mental health issues are more likely to drop out, research has shown. Laura Krantz, BostonGlobe.com, "Mental health is a college stumbling block. For students of color, it can be a wall," 10 July 2018 Just like withdrawals are a symptom of addiction, the addiction is often a symptom of untreated mental illness. The Cut, The Cut, "The Mom Who Was Pregnant and Addicted to Opioids," 17 May 2018 When parents are interviewed at the start, Family Promise looks for signs of drug or alcohol abuse, recent domestic violence or untreated mental illness. Don Stacom, courant.com, "Hometown Heroes: Helping New Britain-Area Homeless Get Back On Track," 3 May 2018 Since at least 2013, when a severely disabled Broward County girl died in slow agony from an untreated illness, the Carlton Palms Educational Center has been under an administrative microscope as state regulators sought vainly to shut it down. Carol Marbin Miller Monique O. Madan, miamiherald, "Beset by rapes, rats, scalding, Florida home for disabled home could lose license | Miami Herald," 26 Apr. 2018 First there is the corrosive effect of untreated mental illness on quality of life for millions of Americans. Scott Breitinger, STAT, "3 ways to expand access to mental health care beyond adding more psychiatrists," 20 Apr. 2018 Left untreated, high blood pressure is a risk factor for having a heart attack or a stroke. Cara Rosenbloom, chicagotribune.com, "Ignore calories and BMI. Here are the health numbers that really matter.," 9 July 2018 As a result, black youths often go undiagnosed and untreated, and their mental health continues to suffer, potentially leading to dropping out of school, poor physical health, and substance abuse. Aneri Pattani, Philly.com, "Police killings strain mental health of entire black community, study finds," 21 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'untreated.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of untreated

15th century, in the meaning defined above

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Last Updated

21 Sep 2018

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The first known use of untreated was in the 15th century

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More Definitions for untreated


un·treat·ed | \ -ˈtrēt-əd \

Medical Definition of untreated 

: not subjected to treatment an untreated disease

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More from Merriam-Webster on untreated

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Spanish Central: Translation of untreated

Nglish: Translation of untreated for Spanish Speakers

Comments on untreated

What made you want to look up untreated? Please tell us where you read or heard it (including the quote, if possible).


to deposit or conceal in a hiding place

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